Several in-game currencies like Simoleons(The golden coins) are earned by upgrading buildings and trading; Simcity Buildit MOD APK (The green keys)are earned by completing certain buildings or touring other cities. NeoSimoleons (earned through Omega Building) and War Simoleons(The purple coins) are earned by participating in wars and are used in buying war items). Golden Keys are earned by completing trading, disaster challenges, or by watching ads;